LDN 900 HaLRGB (Michael J. Mangieri)

Celestial hemisphere: Northern · Constellation: Cygnus (Cyg) · Contains: LBN 259 · LBN 270 · LBN 273 · LBN 274 · LBN 278 · LBN 279 · LBN 280 · LBN 281 · LBN 292 · LBN 293 · LDN 897 · LDN 899 · LDN 900 · LDN 901 · LDN 902 · NGC 6914 · VdB131 · VdB132

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LDN 900 HaLRGB

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LDN 900 HaLRGB

LDN 900 is a Dark Nebula in the constellation of Cygnus. It is approximately 8 arc-minutes in size.
Dark nebulae are interstellar clouds that contain a very high concentration of dust. This allows them to scatter and absorb all incident optical light, making them completely opaque at visible wavelengths. The nebula (centered in the image and running top to bottom) obscures the background of dust and ionized gas.
The blue regions are vdB 131 (upper) and vdB 132 (lower). These are both reflection nebulae, regions of what have been dark nebulae if not for the fact that the dust reflects the light from nearby bright stars that is not hot enough to ionize the cloud's hydrogen. This scattered light generally appears blue since the typical size of dust grains in the cloud are comparable to the wavelength of blue light.

Please note: The following tables are updated every 24 hours.

Distribution of astrophotographers

This table shows the number of distinct astrophotographers who have been assigned and IOTD/TP award compared to the total number of images awarded.
	Distinct awarded users	Total awarded images
Image of the day
Top picks
Top pick nominations

Distribution of subject types

This table shows the distribution of awards per subject type, compared to the popularity of images of that subject type.
	Image of the day	Top pick	Top pick nominations	Total submitted
Deep sky
Solar system
Extremely wide field
Star trails
Northern lights
Noctilucent clouds
Landscape

Distribution of data sources

This table shows the distribution of awards per data source, compared to the popularity of images acquired from that data source.
	Image of the day	Top pick	Top pick nominations	Total submitted
Backyard
Traveller
Own remote observatory
Amateur hosting facility
Public amaeteur data
Professional, scientific grade data
Mix of multiple sources
Other
Unknown

The “AstroBin Image of the Day and Top Picks”, or IOTD/TP, is a long-running system to promote beautiful, interesting, peculiar, or otherwise amazing astrophotographs, with a focus on technical excellence. Learn more.

Submitted The date and time when you submitted this image for IOTD/TP consideration.	...
Views by Submitters (available since September 19th, 2023) Every image is assigned to 50% of available Submitters. In the event that at least 80% of them don't view the image before its time in the IOTD/TP process expires, it's assigned to the other 50% of Submitters and the process begins anew.
Promotions by Submitters When 3 distinct Submitters promote the image, it moves on to the next stage of the process: evaluation for Top Pick status. This requirement, in addition to anonymization of images and distribution to only a subset of them, prevents biases and ensures that the best images are selected.
Promotions by Reviewers When 3 distinct Reviewers promote the image, it moves on to the next stage of the process: evaluation for IOTD status.
Early dismissal Staff members have a lot of images to inspect on a daily basis, and they can dismiss images if they believe they don't meet the requirements for IOTD/TP selection. If an image is dismissed 5 times, it's removed from the process. This streamlines the process and ensures that any bias present in promotions could be overruled by other staff members.

Status	Advanced success
Started	...
Astrometry.net job	5113597
PixInsight job	R0O9TJ0JIB56V6DYNSIWGPI7FMGWTCWE
PixInsight queue size	n/a
PixInsight stage	TASK_LOG

RA (center)	20h24m42s.22
RA (top/left)	20h18m07s.56
RA (top/right)	20h30m17s.35
RA (bottom/right)	20h31m25s.38
RA (bottom/left)	20h18m57s.66

Dec (center)	+42°46′36″.7
Dec (top/left)	+42°08′46″.2
Dec (top/right)	+41°52′43″.10
Dec (bottom/right)	+43°23′02″.5
Dec (bottom/left)	+43°39′29″.8

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LDN 900 HaLRGB

LDN 900 HaLRGB

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LDN 900 HaLRGB

LDN 900 HaLRGB

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